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What is 'Quasar'
Definition: Quasi Stellar radio sources, abbreviated QUASARS, are the most dynamic and far-off objects in a collective known as active galactic nuclei (AGN). These radiant sources were formed approximately twelve billion years ago. Quasar formations take place by collision of galaxies, i.e., the central black holes merge to form a super-massive black hole. Quasars were foremost identified as red shift sources of electromagnetic energy, including radio waves and visible light that are akin to stars in appearance. Its spectrum consisted of wide emission lines, unlike stars, thus the name “quasi-stellar.”
Description: Initially, Quasars were indistinguishable from stars as they appeared as point sources. With the advent of infrared telescopes and the Hubble telescope, Quasars were finally detected. The luminosity of various quasars is lower in the optical range and higher in the X-ray range. Quasars are fueled by accumulation of material into the nucleus of super-massive black hole, which are faraway galaxies.
About 2,00,000 Quasars are known till date and all of them have similar properties. All Quasar spectra have red shifts in the range .056 and 7.085. As per the Hubble law, all these are 28.85 billion years away. The power of these Quasars arises from the super-massive black-holes that are assumed to exist at the core of galaxies.
They are the most luminous objects in the universe, the brightest in the constellation Virgo. Quasars reside in the center of active, young galaxies, and are amongst the most luminous, powerful, and vibrant objects known in the universe, emitting up to a thousand times the energy output of the Milky Way, that constitutes 200–400 billion stars.
Description: Initially, Quasars were indistinguishable from stars as they appeared as point sources. With the advent of infrared telescopes and the Hubble telescope, Quasars were finally detected. The luminosity of various quasars is lower in the optical range and higher in the X-ray range. Quasars are fueled by accumulation of material into the nucleus of super-massive black hole, which are faraway galaxies.
About 2,00,000 Quasars are known till date and all of them have similar properties. All Quasar spectra have red shifts in the range .056 and 7.085. As per the Hubble law, all these are 28.85 billion years away. The power of these Quasars arises from the super-massive black-holes that are assumed to exist at the core of galaxies.
They are the most luminous objects in the universe, the brightest in the constellation Virgo. Quasars reside in the center of active, young galaxies, and are amongst the most luminous, powerful, and vibrant objects known in the universe, emitting up to a thousand times the energy output of the Milky Way, that constitutes 200–400 billion stars.
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